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A108077
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Largest prime p such that p-1|n.
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1
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2, 3, 2, 5, 2, 7, 2, 5, 2, 11, 2, 13, 2, 3, 2, 17, 2, 19, 2, 11, 2, 23, 2, 13, 2, 3, 2, 29, 2, 31, 2, 17, 2, 3, 2, 37, 2, 3, 2, 41, 2, 43, 2, 23, 2, 47, 2, 17, 2, 11, 2, 53, 2, 19, 2, 29, 2, 59, 2, 61, 2, 3, 2, 17, 2, 67, 2, 5, 2, 71, 2, 73, 2, 3, 2, 5, 2, 79, 2, 41, 2, 83, 2, 43
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MAPLE
| with(numtheory): for n from 1 to 110 do div:=divisors(n): A:=[seq(div[j]+1, j=1..tau(n))]: B:={}: for i from 1 to tau(n) do if isprime(A[i])=true then B:=B union {A[i]} else B:=B: fi: od: C:=convert(B, list): a[n]:=C[nops(C)] od: seq(a[n], n=1..110); (Deutsch)
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CROSSREFS
| Largest term in row n of A108939.
Sequence in context: A086765 A079868 A088444 * A141310 A007389 A007388
Adjacent sequences: A108074 A108075 A108076 * A108078 A108079 A108080
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KEYWORD
| nonn,easy
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jul 20 2005
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 05 2005
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